Answer:
a) located in the outermost energy level.
Explanation:
A valence electron is an electron in the outer shell associated with an atom, and that can participate in the formation of a chemical bond if the outer shell is not closed; in a single covalent bond, both atoms in the bond contribute one valence electron in order to form a shared pair.
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Well, magnesium is highly flammable, especially when it is in powder form or in strips.
Answer:
It equals to the number of electrons in that atom, which is in turn equal to its atomic number
Explanation:
<u>Answer:</u> In the given chemical equation, the substance getting oxidized is magnesium metal.
<u>Explanation:</u>
Oxidation reaction is defined as the chemical reaction in which an atom looses its electrons. The oxidation number of the atom gets increased during this reaction.

The chemical equation for the reaction of magnesium and hydrochloric acid follows:

The half reaction for the above equation follows:
<u>Oxidation half reaction:</u> 
<u>Reduction half reaction:</u> 
Hence, in the given chemical equation, the substance getting oxidized is magnesium metal.
The following that is not true about chemical changes is "<span>They can be reversed by physical changes.", the answer is letter B. A chemical change can form a new substance, can be detected by the change in color and they have properties different from their starting materials.</span>